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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a497024a24984eb480d3449e28b73572e5370e91897fb3a1ff7a254a1b5eb4e8' 
  AND token = '9l0/um/5V122jFlwVfWgk3ZghWD7d4dNHq6ovglnul0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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