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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df920430f8006f439942805cd6e57a4391b531fad83b589ce29d569a4e173793' 
  AND token = '10GeddMnOAslLVWeo3HJdDwIuUlo06me5x/z5X+3X6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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