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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb88b273bbc03dc8985b5ec80a276569326afbce8e8fa60494965996bc3295d' 
  AND token = 'wbCmtsBwt6ODY9e7XbgAFIO3FkR7SYB4ksmZIzK5om8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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