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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8fa497edfd80d836045d86df0af7d5e7f127277271f32151d92f307f5bb0d80' 
  AND token = 'BvSOeGTx9w7cDUlH37X8BYbvJ3Ja78SVy7LHkd30t6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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