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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241e68bec82d2b7001043ec0d6442cdce17b9f33093acf6a0728e746ca93e4b6' 
  AND token = 'birLcSjf69CR8De99in1qQr6NYApq641CaufWLcKYzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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