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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6eb3a651111d552fdb8cec2b103a03dbb5da4dc47b06d0f1a6a6fc47fe5630' 
  AND token = 'lMIK+GYVFS5SSGKSf5D1UwEbhtAYWFLCqebSwd19QVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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