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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc2758b4a3ae1e137bd15c347a163ed6e0e6b4d313f71eb0df24acbf9e0cf14' 
  AND token = 'fhMN/d7DcFq9q/UBbufuZ3PKKlpBK21bhSE85iDcmX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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