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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d4ff3c02d3c5c9e7ff5e9ca788995c7e7cb98303084ed1c61d984908c5283c' 
  AND token = 'F58ZyMW9/DML5eTZOUgoPxVqCUFZu53IoKoUw3l7jlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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