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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '484f345ea9b38ea5009f2692781b8e25edef379a480cffec7a3db2d002df680b' 
  AND token = 'vH57ioB5C4jliTkdniF4xAx7d7eTea6AZsT8eYD6ifI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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