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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c6b4b02ed26fc04ab8538595ab286aab1ababdb3461ae9804513b94d5fff16' 
  AND token = 'NMh0Qi6u47jR9LRRQoIYmI/B4aG5B2o7lE+PODZRI2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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