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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05b629ccb320d1343a25a7d8db97b1fcddf8b3be85c3f7ae832349fc92ded52' 
  AND token = '7eIbWHxwIG90iWyXwU27+Wjxj6XkphhPflf9zw6wHU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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