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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4e3efa8df00b0d53a4fa3ab43c922857616cbe4247f77a571f09f8d2251f0b' 
  AND token = 'xZIabPyszF1KXMeDRW2rnuBZ6q12ZCf2prep0LaSF38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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