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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d89ab4e6e23f6769ec4c988755933c2bd74cb7217e42db8297d7c079ca2a6ab' 
  AND token = 'IggZrlXGME12q5AejjpYM4jj1F49xsRBgR/L64NTiMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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