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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2532479144bd0c0f6b6a673f4fbec7c22ca2410e741e0d2cf619864689ae0f' 
  AND token = 'NJNl3g7pvtcgt2HZLpAB9BdvrrMAKMuscpoyVurcuTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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