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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91e88dd98774cf4918e13f349b7564a30526d4337cc8a87fc5f25870248004a' 
  AND token = 'S0yDYtY7aTcW908YOCerd6BR78OyAqJAiraqdbbiaEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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