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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f31cefd64f44cebbe3113e2093087246a9f47f8b4e1c8fab3cc26f362bf2ff' 
  AND token = 'LyZQYuSbbtTPCzUnO4Xq6JeszvXfXFksOW2ygD7FywY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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