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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ac09e9a630b836077154d04b44ab88ec1c8df3a579146e695f9a14d68bf659' 
  AND token = 'm/yN7fjPZM4dDgmFd91y8uch62Ja3NYZj495fkvFBqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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