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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963931163a648ecc8837a9c44b33d5f690febf0f618fc85d941e1c8e8d2d639e' 
  AND token = 'GFYzeheMJ7q6CfXAql69tl6CuMH/uET0GuwON6w6lww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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