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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d47536d4a2dffdb14b4d484d261cda05332db3b5b85625faada6659f04853f6' 
  AND token = 'I9tARhtQfOBOCJ2YZnOqCK4LF4nc6mVTdNsmsn0DQek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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