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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a00cd0ab0ffcc6d14f27e2b5b90611bced55d10f4a11ce53b776dc9c0ff67b27' 
  AND token = 'QsVnZNdZEIwwuOB8Ws53tDXkL+gkEEidCra0eOobosw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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