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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1aa9be707bb45ce75003cafed4544c89d4c8c053c773ccd472a0388fe16827f' 
  AND token = 'xVaGMWT2/jZaJBq4duiBszwJzJmw3xg2sCuFsbsj9IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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