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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fbae2193d940d99c17feb6c5f926bcda9b686ea5b59a9d62f9857a9300dfde' 
  AND token = 'Jz8EMYgBmJ2EFc1tng8QAUTPlUhC1UI+tUylGKVIg14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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