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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51ca9bfdb9f580c291a29f76dbc2d8b075f0ca6ac2333baedf125c9532b6a76' 
  AND token = 'zqUSFPk/cYxfPorSikMhzUA/bEbBaZ094NoMitOg9WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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