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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da8a0dd19b817776522f07cbd10709a6d38e46fe128a7ee09e4cd583f2da037' 
  AND token = 'EuoFASh8dMB00kOONRpubvQNdDLvAU52TrryXOkjT0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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