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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43e12d371a94533f542464856c2939c0b8f5ca23435dc4b6a277c861ae87003' 
  AND token = 'iDUALsbDso9oqDcOH3l58DX4d3E/lhvdB39nkZSFA6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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