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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24beb3df1e0e673265498602cdce730ddc93667c4e9ce93aacf3357f2a01a6c7' 
  AND token = 'urRmN4qj3YZXOlXQVUAfJtgXprcF+9Wtg2/sxLRhJoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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