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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5e0146e0f33e67b05d7e3d15f7076c72c759cf33cee9bb41660cf9c6284990' 
  AND token = 'zUHCYuLLLizuKNJDZVIVRo2Qm1a61oaXqu5dRvJXUWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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