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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e598d1f4f863dffe4104f3d0c46795a3ac8db09737ee34d23ad5fd7069592df' 
  AND token = 'bnkPQuptzug7wbq2labu2m6GO7kmfyYpbMMVOJKo6Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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