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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0328b0c0cb593e657b1359c57f123a6461f0b16260a04fa4fbb46f39821b02c2' 
  AND token = 'sh9tyGdzn32cQ2sdf17jZGxGeaAL5BdHoHluxximu50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00175

JSON explain

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