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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd719f249893c93a0e1968226e3b9cc1abb1feda68ed9f73cb607c23f16c7236b' 
  AND token = 'M2SO9HABdZuElbaWVwWIdmqc/obVJKkCtAdhMZmxdFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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