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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6acec979d7a75b4d1f7bda9b66243252e8ec269da0863db252777baddecbe3' 
  AND token = '/oo34A4K3L7+PgPTc9uXbB7glEESgY90M3tkxxHXBpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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