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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230bba124ac98c846c58d3304034fb21c09701121fcd158f762bb41ead583f3b' 
  AND token = '5DR/QZkc2oAGLORUDoFyz0bA2EanqCkyey3tHE+RLQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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