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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bcebdddddbc1673f044a77667840aa6c85a0480a72d587384d4cabcacad364d' 
  AND token = '6HaoxNyz2QBCak79at+G27OGJ6uSQwose949W3VEYew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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