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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5cc96bb88f41e9fe02c06862bf9c37643eecf7d63dec5e8ed84b6f4ad2c2be' 
  AND token = 'amRXx3oU5Ohwe0GLaRVoH+wiTz7SeLCNUm2E4ZjvsH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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