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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c4b3c3720992ea0cfb3e07e3d743a751732490b973101b2e0bcafe9ca5d2bd' 
  AND token = 'b/efUpprdkh686R4/u0f9V4bHl1nGDt9jZoosVbv3dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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