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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38749ee816b06f6ad0ef8cf69918a51e23d1e5b5c78985839a9edda25d5e638' 
  AND token = '3sUpJChIaGtfAMcW7ryiM28XPk43iTII+hxJENu9v8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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