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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dacbcbfccc75dd82c857aca8324eaf960cdb9c7d05b6ac336a628cf70d72ba4' 
  AND token = 'PWBS5io8ARgxXnOqvVp57P3a5mDRhpY12Yq3yHVG85c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}