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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1582d9c714e6d9d52d45a324df0999f931e0886b761528c36eee9cdb04e9fd6' 
  AND token = 'f4eRhxcM0P95Tu2USkHkW5Qakty3J7MgdQeQR0Z3eAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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