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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951b488f03dcba01c5db933ab5caa0e6c3db87051a86cd6a7c689e0a136eccb0' 
  AND token = '/23alZwjqA/IVIlsPwJT8+OWnkOXphbrpWH2zDjooms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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