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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64613fe582e231e31b5ba9019255d5dbc1ca3f492fec59a843ac067d3672a4cd' 
  AND token = 'FNqxRYxiMJTtBsIET/bw2nTFojLHqq1GiR9wsVePOig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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