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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3faa6d3756f95fd98ffa829c5be1bcb51399fd8cd29017a308ad9de204f327be' 
  AND token = 'vlXcK+ullFFZPszxctJMVLwPIHvopcc5+cDyA0mOPy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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