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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb5dec3b0fa08bf8203da950714d7ed1b75b3cf102e2fec3ac5a5cc2311744d' 
  AND token = 'v7HGb0wAJTkv+EvDQApVJX3tL363jGeLqP+a/cqSEJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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