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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c929aa17f8a32a28fa4f2ec930ce22b1b170f66fde8a95d735436f02297541b0' 
  AND token = 'cW50W451jvctVjKM221Xu75F273mjUzq8TnwojmX3GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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