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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01a86191a60e8fd3efed689c39d984f057c5da5f4df0ecd37fb689ff289ae25' 
  AND token = 'dwATzGqCnS73y7f1koEyDl0+dG9ivCAkUC/RTk8YRb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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