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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9904f669d5b100eda9f69cdf4d2e5a85545c971da6055392f857bbb4e7efee21' 
  AND token = '1p8kS0lfCCKX3GJ5Rm6Y2DQPqBMiWcEFXs3skR+bc/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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