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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14691a46d680b0c33929cb465cf065d44fc611509686ba649b72e3c8cb6d598' 
  AND token = 'w5mKQkPtrbxWiXJ9S7Xu66Jh1S9oEbYjeCItMOQT14U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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