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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ce1d7061ed4dde64a7a42f0e26ed9b8bca577d0ecc8f85d936278b6031a0bf' 
  AND token = 'iin9lATRVPQCCVedmkmUa/9axPsP8Kqqtfhl8CMKVjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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