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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bebb9f96bd44b50bce980dba01eddcfe51ea9f8319a33f5ff038c88948529f2' 
  AND token = 'uvUgJua3PT0ZjMq9zSLVWncrhQ+ABvgoeMlHZu4+4vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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