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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36de133cb90608f19a2911f217cb0968f2f2279343c85f66edf22cc9fa8041c' 
  AND token = 'se7N9k7/NLqaoz83zNtQ5aDqJL4amiYC601iEKJg7bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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