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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193fd6f7ae4704c3aedb4481f6cbdbd8285f1860188c2c5a3c8c48a9e6097c72' 
  AND token = 'LWuuSCgmGkzQOFFtTQbGVmSIaG9qekF/xGCgsA1melY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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