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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8b8020eb28555331f6575c9d326220df3c0c409fd830d07973558d36c5f841' 
  AND token = 'jPCa2jOp6tNb3KS7EHRh2TSdSvm5sxSOzpJwn0aurbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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