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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0a05e467af4e1c977a5c32bba555c84c0d9e47dfedc8186c262b9b2063ec5f' 
  AND token = 'G+h/4OUfEwhJshRvW8Fixr4ey8MFAgPN6ahNBBrt47A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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