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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17d9030f7ae05096b3a48267b0281669fbf52696fd914b5ef6b1a1068c44346' 
  AND token = 'O7F6EkKcxGG4RXxgtWwSRHiIO/svK+5RbqGqXEK8/2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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