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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df49cb89a67e2dd6138a35f6557f5b3156b091d5cc89a5b7cec5ec4b8c6abbf5' 
  AND token = 'hgkMPT3n39q31g2EXm8E/IERZKwdA9alOqgVsJ+CQb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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